<template>
  <div>
    <!--面包屑导航区域-->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert
        title="注意：只允许为第三级分类设置相关参数！"
        type="warning"
        show-icon
        :closable="false">
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            clearable
            @change="handleChange"></el-cascader>
        </el-col>
      </el-row>
      <el-tabs v-model="activeName" @tab-click="handleClick">
        <!-- 动态参数tab页 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                :key="tag"
                v-for="(tag, i) in scope.row.attr_vals"
                closable
                :disable-transitions="false"
                @close="handleClose(i,scope.row)">
                {{tag}}
                </el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column
              prop="attr_name"
              label="参数名称"
              width="180">
            </el-table-column>
            <el-table-column
              prop="attr_vals"
              label="参数详情">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 静态参数tab页 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag
                :key="tag"
                v-for="(tag, i) in scope.row.attr_vals"
                closable
                :disable-transitions="false"
                @close="handleClose(i,scope.row)">
                {{tag}}
                </el-tag>
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column
              prop="attr_name"
              label="属性名称"
              width="180">
            </el-table-column>
            <el-table-column
              prop="attr_vals"
              label="参数详情">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <p>{{scope.row.attr_id}}</p>
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @closed="addDialogClosed">
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @closed="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      cateList: [],
      // 级联选择器的配置对象
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id'
      },
      // 级联选择框双向绑定的分类的id
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加表单的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur'}
        ]
      },
      // 修改表单的表单数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur'}
        ]
      },
      // 修改参数对话框的显示与隐藏
      editDialogVisible: false,
      // // 控制按钮和文本框的切换显示
      // inputVisible: false,
      // // 文本框中输入的内容
      // inputValue: '',

    }
  },
  created() {
    // 商品分类
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList() {
      const {data: res} = await this.$http.get('categories')
      if(res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.cateList = res.data
      // console.log(this.cateList);
    },
    // 级联选择框选中项变化的触发事件
    async handleChange() {
      // console.log(this.selectedCateKeys);
      if(this.selectedCateKeys.length !== 3 ) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 选中的是三级分类
      // console.log(this.selectedCateKeys);
      this.getParamsData()
    },
    // tab页签点击事件的处理函数
    handleClick() {
      console.log(this.activeName);
      if(this.cateId !== null) {
        this.getParamsData()
      }
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 根据所选分类的id，和当前所处的面板，获取对应的参数
      const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
        params: {sel: this.activeName}
      })
      if(res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      res.data.forEach(item => {
        // tag值处理
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框中输入的值
        item.inputValue = ''
      })
      console.log(res.data);
      if(this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 添加参数对话框点击确定按钮
    addParams() {
      // 表单的与验证
      this.$refs.addFormRef.validate(async valid => {
        if(!valid) return
        const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if(res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    // 点击修改按钮，弹出修改参数对话框
    async showEditDialog(attrId) {
      // console.log(attrId);
      // console.log(this.cateId);
      // 根据ID查询参数
      const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
        params: {
          attr_sel: this.activeName,
        }
      })
      if(res.meta.status !== 200) {
        return this.$message.error('查询参数失败！')
      }
      console.log(res.data);
      this.editForm = res.data
      // 展示修改对话框
      this.editDialogVisible = true
    },
    // 点击修改参数对话框的确定按钮，进行参数的修改
    async editParams() {
      // 验证表单
      this.$refs.editFormRef.validate(async valid => {
        if(!valid) return 
        // 编辑提交参数
      const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
        attr_name: this.editForm.attr_name,
        attr_sel: this.activeName
      })
      if(res.meta.status !== 200) {
        return this.$message.error('修改参数失败！')
      }
      this.$message.success('修改参数成功！')
      // 获取参数的列表数据
      this.getParamsData()
      // 隐藏修改参数对话框
      this.editDialogVisible = false
      })
      
    },
    // 修改对话框关闭
    editDialogClosed() {
      // 重置修改的表单
      this.$refs.editFormRef.resetFields()
    },
    // 根据属性Id，删除参数
    removeParams(attrId) {
      this.$confirm('此操作将永久删除该参数项, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(async () => {
          const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
          if(res.meta.status !== 200) {
            return this.$message.error('删除参数项失败！')
          }
          this.$message({
            type: 'success',
            message: '删除成功!'
          });
          this.getParamsData()
        }).catch(() => {
          this.$message({
            type: 'info',
            message: '已取消删除'
          });          
        });
    },
    // 文本框失去焦点或按下enter键，都会触发
    handleInputConfirm(row) {
      // 输入不合法的内容
      if(row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      //  如果没有 return，则证明输入的内容，需要做后续处理
      console.log(row);
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    // 将对 attr_vals 的操作，保存到数据库
    async saveAttrVals(row) {
      // 发起请求，保存这次操作
      const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(','),
      })
      if(res.meta.status !== 200) {
        return this.$message.error('修改参数属性值失败！')
      }
      this.$message.success('修改参数属性成功！')
    },
    // 显示文本框
    showInput(row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // $nextTick方法：当页面上元素被重新渲染之后，才会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus();
      });
    },
    // 删除对应的参数可选项
    handleClose(i,row) {
      row.attr_vals.splice(i,1)
      this.saveAttrVals(row)

    }
  },
  
  computed:{
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled() {
      if(this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前选中的三级分类的id
    cateId() {
      if(this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if(this.activeName === 'many') {
        return '动态参数'
      } 
      return '静态属性'
    },
    // tags
    dynamicTags() {
      this.manyTableData.attr_vals
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.el-input {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>